Bug Description

1. Proceed an OEM installation, select English
2. Then, proceed to step 2 (mark for validation)
3. After reboot, on user creation, select a different language like French.
-> Once the user is created and logged in, his session is still in English. Same for login screen.

Notes:
* This is reproducible on 18.04.1.
* This is reproducible as well on 18.04(.0) install without network